Steam injector



A ril 23, 1929. BROOKE 1,710,566

STEAM INJECTOR Filed Jan. 15, 1927 2 Sheets-Sheet 2 Inventor 4fltborneys Patented 23, 1929.

UNITED STATES nonnn'r. enunnx nnooxis, or neccnnsnrntn, Ens-Lani),ass'ienon ro notnnit & sao o'xs, LIMITED, or MANCHESTER, ENGLAND.

- STEAM-INJECTOR; 9

This invention relates to injectors in which use is made of exhauststeam, in some cases the pressure of the exhaust steam ClflftllGSconsiderably, and may prove inconve n nt.

For instance, on a locomotive,.the pressure of the exhaust in the pipesupplying the nj ector may be anything from Oto say 20 lbs. per square,inch ormore, above atmosphere and it this variation or" pressurereaches the injector, the latter requires.regulating by hand to meetsuch variation, thus necessitating care and I attention on the part ofthe driven.

' One object of the present invention is to regulate: automatically thepressure of l the exhaust steam when entering the injector irrespectiveof the pressure of the exhaust steam in the supply pipe therefor.

An exhaust injector will work with steam at from 0 to say 7 lbs.pressure without regulation and afurther object of the invention is toprovide robust means which will. regulate the pressure in the injectorto values Well within this range when the pressure of the exhaust steamin the, supply pipenecessitates vide, :tor the regulation of exhauststeam pressure in an injector, valve means adapted, in cases where livesteam replaces exhaust steam for feeding the injector, to prevent escapeof live steam, by way of thesupply pipe, for the exhaust steam. I

These and other minor objects will rea appear from the description nowabout to be given with the aid of the accompanying drawings in whichFig.1 is a side elevation and Fig. 2a plan, each with parts in section,of

1 outside of the casing through a packed gland an attachment to the bodyof an exhaust injector fitted with the regulating means. Fig. 3 is anelevation at right angles to Fig. 1. i

As here shown the exhaust steam supply pipe 1 is connected totheinjector body 2, to the rear of a valve 3 which separates the pipe 1from a chamber- 4 at what for convenience may be termed the regulatedpressure side of the valve. In the example, a butterfly valve is shown,though a valve of any other suitable balanced type may be, employed. Thevalve 3 is actuated by an external lever 5 securedto the spindle 6 whichis brought to'the 7. To the lever 5 is connecteda tension spring8'tending normally to hold the v lves open. The tension of this spring 8can be adjuster in any suitable way such as by turning a nut 9 dily 'upon a screw threaded eye bolt 10. The lever 5 is connected by a link 11to a piston 12 constituting .vith the'cylinder l3 and aclosure 14, achamber 15 which communicates with the I exhaust steam chamber lby apassage 16.

.. The injector for use in connection withmy invention is intended .tobe equipped with a change-over valve such as is illustrated inthespecification of Letters Patent No. 1,706,346 so that whe'n,'as on alocomotive, the engine is not under steam and there is no exhaust towork the injector, live steam is used to take theplace of the exhaust,the valve rcterred to-automatically establishes the live steam supply asan auxiliary as soon as the exhaust supplystops. llhus whilst 17represents the passage intended to be connected to the branch 32 of thechange-over valve of thesaid earlier application and so conduct livesteam to the live steam spindle means supplied through the passage 18,19similarly represents the passage intended to I be connected to thebranch '33 of the'change- I over valve wherebylive steam. is, when de--,I

the chamber 15 as and for the purpose to be hereinafter described.

Broadly the action is as follows -Assuming exhaust steam to be availableand the valve 3 to be open, then a portion of such ex haust steam willpass from the pipe 1 to chamher 4, and thence by passage 16 to chamber15,

' opening the valve 20 if employed. As the:

, pressure in chamber ttends 'to-rise'so will it also tend to rise inchamber 15where, acting I uponthe piston 12, it tends to overcome the,

pull of thespring 8 thereby gradually close.

the rise in it due to increasing pressure in the pipe 1 will be limitedso as to obviate independent regulation of the injector.

.lustrated, live'steam'is introduced at 19 as an auxiliary to exhauststeam when the latter is not available, a portion of such live steam isat the same time conducted through passage When, as inthe more specificexample il- 21 directly into the chan'iber 15. This steain being unable,because of valve 20, to find its way out of the chamber 15 acts on thepiston 12 in such a manner as to close the valve 3 to the fullest extentpossible thus pernnttmg no or next to no steam to pass from chaniber 1to the p1 pc 1. It is of course understood that the live steam suppliedto the chainber 4t an auxiliary source is reduced to the quantity oipressure required, no regulation being necessary. V

' What I 01211111 is 1. An attachment for exhaust steam injectorscolnprlsnig, 1n co1nb1nat1on with a rotary valve controlling the steaminlet, spring-- actuated means external to the injector body or casingconnecting said valve with a fixture on said casing and tending to holdsaid valve open, and steam-actuated ineans exter nal to said casingtending to close said valve in opposition to the spring; saidstean1-actuated means comprising a cylinder attached to said caslng, apiston 1n sald cyhnder, a steam inlet passage leading from the interiorof the cas1ng into said cylinder, and connections between said plstonand valve whereby the latter is adapted to close when the pressurewith-' i in the casing increases and-to open when the pressuredecreases.

2. An attachment for exhaust steam inj ectors comprising a rotary valvecontrolling the steam'inlet; said valve being fixed on a shaft having anupstanding arm or lever on the outside of the casing, a springconnecting said lever-with a fixture on the outer side of the asing andby its pull tending to open said valve, and steam-actuated means tendingto close said valve in opposition to the spring;

said steam-actuated means comprising a cyl irrespective of the pressureof the exhaust steam supply therefor. v

Signed. at Manchester, England, this third day of January, 1927.

ROBERT GRUNDY BROOKE

